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MVME51005E Single Board Computer Installation and Use (6806800A38B)
5 RAM500 Memory Expansion Module
52
*Common GND pins mate to GIGA assemblies with ground plates.
RAM500 Programming Issues
The RAM500 contains no user programmable registers, other than the Serial Presence Detect
(SPD) Data.
Serial Presence Detect (SPD) Data
This register is partially described for the RAM500 within the
MVME5100 Single Board
Computer Programmer’s Reference Guide
. The register is accessed through the I
2
C interface
of the Hawk ASIC on the host board (MVME5100). The RAM500 SPD is software addressable
by a unique address as follows: The first RAM500 attached to the host board has has an SPD
address of $AA. The second RAM500 attached to the top of the first RAM500 has an SPD
address of $AC.
127
SDA
128
129
A1_SPD
MEZZ2_L
130
131
GND
132
133
GND
SDRAMCLK3
134
135
+3.3V
136
137
SDRAMCLK4
138
139
GND*
GND*
140
Table 5-4. RAM500 Top Side Connector (J1)Pin Assignments (continued)